Effect of angular orientation on the hydrodynamic forces acting on a body in a restricted waterway

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Abstract

A slender body theory method developed for a body moving
parallel to a wall in shallow water is extended to include
angular orientation of the body to the wall. The method
satisfies only the zero normal velocity condition on the external
boundaries but does not take into account the effect of induced flows on the body itself. A spheroid and a Series
60, block .80 hull were the bodies studied. The side force
and yaw moment on each body were determined numerically for
varying angular orientation with respect to either a single
wall or canal bank. For both cases results for a range of
depths and wall separation distances are presented. It is
found that the method gives good qualitative side force
predictions for a body moving parallel to a wall, but is unable
to correctly predict the yaw moment or the side force due to angular orientation. This result dictates the need
for a more complex mathematical model to properly represent the flow than the simple model and quasiâ steady method used here.